/// <summary>
/// 先关后开.
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void closeOpenToolStripMenuItem_Click(object sender, EventArgs e)
{
// 遍历当前窗口的所有 mid 子窗口.
foreach (Form oldForm in this.MdiChildren)
{
// 如果窗口类型为 指定类型，那么先关闭掉.
if (oldForm is FormCloseOpen)
{
oldForm.Close();
}
}
// 关闭旧窗口以后，简单创建新窗口 并显示.
FormCloseOpen newForm = new FormCloseOpen();
newForm.MdiParent = this;
newForm.Show();
}
/// <summary>
/// 先关后开.
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void closeOpenToolStripMenuItem_Click(object sender, EventArgs e)
{
// 遍历当前窗口的所有 mid 子窗口.
foreach (Form oldForm in this.MdiChildren)
{
// 如果窗口类型为 指定类型，那么先关闭掉.
if (oldForm is FormCloseOpen)
{
oldForm.Close();
}
}
// 关闭旧窗口以后，简单创建新窗口 并显示.
FormCloseOpen newForm = new FormCloseOpen();
newForm.MdiParent = this;
newForm.Show();
}